posted May 27, 2002 07:09 PM
what do most of you all run for gears on 1/4 mile track .Banking is some were around 15 degrees.i have a strong 383. with 90" to 92" tires on back of car.i had a final of a 7.6 was spining comeing of bad .and i was runing 6000 rpms before end of strightaway.and 6500 on exit when i stand in it.i am thinking of going to my 6.7 final.do you guys think that is to big of a change. if so i can go with a 7.1 final.i have been told that i should try to get around a 6.8 or a 6.9 thank you for any help .this is a ford 9" thanks again

posted May 28, 2002 10:13 PM
thank's everyone .going with my 6.7 for this week.try them once or twice. then do the same with my 7.1 and then see were i can go from there .Just wanted to make sure i was in the wright range.my goal is to finally go to a 1 to 1 ratio.i was just reading a story on gears in my July circle track they said for a 1/4 mile 383 or a 406 go with a 6.50 6.66 6.83 and try and stay aroud 5800 to 6000 rpms what do you guy's think .THANK'S AGAIN EVERY ONE. {{{GO FAST AND TRUN LEFT}}}

peddler i already ran a 8.00 and a 7.66 and all i do is spin exiting the turn's.rpms were at 6500 max i have been told that you want to stay around 5500 to 6000 with a 383 or a 406 or you are going past the power band what do you all thik thanks again

ryanMember

posted May 30, 2002 12:34 AM
I beleive what your taliking about would be the 406 and the 377 correct? From what I have read elsewhere you have to really crank on the 383 and the 355's for the H.P. and the 406 and the 377's at 6,000 or under. Never had much expereience at it. Just going by what I've read

ss38kMember

posted May 30, 2002 05:59 PM

quote:Originally posted by ryan:I beleive what your taliking about would be the 406 and the 377 correct? From what I have read elsewhere you have to really crank on the 383 and the 355's for the H.P. and the 406 and the 377's at 6,000 or under. Never had much expereience at it. Just going by what I've read

hello ryan the way i understand it is that a 355 and a 377 both use a 350 crank whitch run better at a high rpm. and the 383 and the 406 have a 400 crank in them and run better at a rpm like 5500 to 6000 versie a 355 or 377 at 6500 to 7000 rpms what do you other guys think hey jammin don't be afraid to speak up thank's guys

wam24uMember

posted May 30, 2002 08:36 PM
ss38...unless someone is building something that I haven't seen before (which is possible) the engines should be like this:

The 377 on up with that 400 crank I've read that you don't want to turn them over 6500 RPM's but with the right crank, rods, and pistons it doesn't mean that you can't. With stock crank, rods, and pistons I wouldn't recommend it though. Remember some people seem to have more luck than others. Whether the motor is still making power at a really high RPM has to do more with the camshaft, valvetrain, and induction more so than the cubic inch. Turning those bigger cubic inch motors up higher just takes more "cubic dollars". Hope this helps!!

The 377 on up with that 400 crank I've read that you don't want to turn them over 6500 RPM's but with the right crank, rods, and pistons it doesn't mean that you can't. With stock crank, rods, and pistons I wouldn't recommend it though. Remember some people seem to have more luck than others. Whether the motor is still making power at a really high RPM has to do more with the camshaft, valvetrain, and induction more so than the cubic inch. Turning those bigger cubic inch motors up higher just takes more "cubic dollars". Hope this helps!!

Bayou

A 377 is a 400 .30 over with a 3.48 350 crank.The math equals up to 377 both ways but I think that usually when someone refers to a 377 they are talking about a destroked 406.jmo

ryanMember

posted May 31, 2002 01:09 PM
Thought we could use another big blue smiley face on here

AC156Member

posted May 31, 2002 01:14 PM
I pulled 5500rpm's at the races last night. ****.......I was hoping for at least 6000 with that set up. Looks like I'll have to put in a 4.11 gear in the rear.

BayouGentMember

posted June 02, 2002 11:39 PM
Ya got me on that one Ryan. Guess that what happens when someone like me grows up around drag racing. When someone talks about a 377 around me, it's usually when they've ordered a stroker kit for a 350. I had never done the math for a destroked 400 but I learn something new every day. Thanks!!

P.S. Thought about putting another blue smiley face but I figured everyone's had enough...LOL.